Stoker construction



lNVENTOR #vl-.MNM RNEY Nov. 6, 1928. v A. M. HUNT STQKER CONSTRUCTION Filed Jan. 27,. `1925 e Patented Nov. 6, 1928.

UNITED STATESe 1,690,116- PATENT OFFICE..

ANDREW n. HUNT, or NEW YORK, N. Y., AssIGNoR To STANDARD sToxnR OIIPANY, INCORPORATED, A CORPORATION or DELAWARE.

sToxER CONSTRUCTION.

Application led January 27, 1325.( Serial No. 5,025.

This invention relates to mechanical stokers and particularly to locomotive stokers wherein a screw conveyor is employed` to carry the coal forward from the tender to the locomotive.

In conveyors of this type and particularly those wherein the c oal is moved beyond the.

mouth of the conduit is intermittent rather than continuous. The coal moves upwardduring a portion of each revolutionof the screw and remains stationary during the remainder of the revolution. Continuous delivery of coal to the re box is desirable and 'zo the main object of theNpresent invention is to provide means for electing this result.

' For this purpose, I provide the conve or `screw at its forward or delivery end wit a plurality of threads so positioned as to vpro- 25 duce a continuous delivery of coal through the u wardly/extendin conduit.

I Ot er ob'ects and a vantages Ofmy invention will appear from the dfollowing description taken in connection with the ac- :ov companying drawing which shows one embodlment of my invention and, wherein. a conveyor adapted to extend from the locomotive tender to the locomotive fire box is shown V partly in elevation and partly in section.

The numeral 10 indicates the rear water leg of a conventional locomotive boiler which is positioned in front of the cab deck 12. 14 is a screw conveyor which is adapted to'carry coalI from the locomotive tender to a point o in the re box below the grate '16. The forward portion'of the conveyor screw is formed of sections 17 and 18. Section 17 drives sections 18 lthrough a universal joint 19 as is customary in housings or conduits 20 and 21 respectively and these. housings are provided with umversal joints as is customary. At the for 'ward end of the housing21 is an elbow 24 o which supports an unobstructed conduit or core tube .25 slightly ex anding which rises tothe discharge mout 26 which isy surrounded by the protective grate 27. Located at the mouth 26 of the conduit I21 is a distributor head 28 whichisformed with openings .mately 3/4 of a turn of the thread. It 1s also ocomotive conveyors of this' `,type. Sections 17 and 18 are 'contained in' 29. adapted to form steam jets to blow the coal ov r the fire. The section 18 of the conveyor screw has at its forward end an additional thread 30 for the purpose of causing thecoal to be delivered to the elbow 24 and upward through the conduit in a continu-4 ous stream. While I have shown the screw conveyor as having a single thread with the additional thread at its forward end only, it will be appreciated that the thread 30 may be continued through a greater portion of the screw. I find, however, that it is preferable to employ the additional thread at the forward end only and of a length of ap roxiobvious that, if desired, an additional number of threads may be employed at the forward end. Care should be taken, however, not to reduce the area of the passage so as to interfere with the movement of the coal.

1. In a locomotive Stoker, a forwardly ex-v tending conduit. which terminates in an elbow, a conveyor screw in said conduit and an upwardly extending unobstructed Aconduit adapted to receive coal from said first named conduit and deliver the same to the lire box, the conveyor screw being formed at its delivering end with a plurality of threads delivering the material in a generally axial direction at their ends so as'to cooperate with said elbow to give a substantially. continuous upward pressure on the material and cause a continuous advance 'screw thread with a plurality of threads de livering .thev material in a generally 'axial direction at their ends so4 as to cause a continuous advance of coal through saidnpwardly extending conduit. 105 3. InI a locomotive stoker, a forwardly extending conduitwhich terminates in an elbow, a conveyor screw in said conduit `and an upwardly extending unobstructed con duit adapted toreceive coal from said iirst 1,10

named conduit and deliver the same oo the fire box, said conveyor screw being formed with a greater number of threads at its delivery-end than the other portions delivering the material in a generally axial direction at their ends so as to cooperate with said elbow to give a substantially continuous upward Vpressure on the material and cause a continuous advance of coal through said upwardly extending conduit.

' 4. In a locomotive Stoker, a forwardly extending conduit which terminates in an elbow, a conveyor screw in said conduit and an upwardly extending unobstructed conduit adapted to receive coal from said irst named conduit and deliver the saine to the fire box, said conveyor screw being formed with a double thread at its. delivering end and a single thread at other portions so as to deliver the material in a generally axial direction at the end of the double threads and cooperate with said elbow to give substantially continuous upward pressure on the material and cause a continuous advance of coal through said upwardly extending conduit.

5. n a locomotive Stoker, a forwardly extending conduit. which terminates in an elbow, a conyeyor screw in said conduit and an upwardl extending unobstructed conduit adapte to receive coal from said irst named conduit and deliver the same to the fire box, said screw being formed with a double thread at its delivering end for an axial distance of approximately three-quarters of a turn of the thread and with a single thread at other portions, said double thread acting to deliver material in a generally axial direction at said elbow.

ANDREVV M. HUNT. 

